Ear | MCQs

Explanation

The Earth behaves like a huge bar magnet with a magnetic field similar to that of a dipole magnet.

Its magnetic poles are near the geographic poles, influencing compasses and navigation systems.

Explanation

The Earth's layers include the crust, mantle, outer core, and inner core.

Magma is molten rock found within the mantle and crust, but it is not a distinct layer.

Explanation

All plants move Anticlockwise around Sun.

All plants move anticlockwise around their axis.

Earth rotates its axis from West to East.

Explanation

The troposphere is the lowest layer of the atmosphere.

This is the layer where we live and where weather happens.

Temperature in this layer generally decreases with height.

The boundary between the stratosphere and the troposphere is called the tropopause.

Explanation

The weight of an object at the center of the Earth is the same as its weight on the surface.

This might seem counterintuitive, but it's because the gravitational force acting on the object is proportional to the distance from the center of the Earth.

At the center, the distance is zero, but the gravitational force is also zero because the object is surrounded by equal amounts of mass in all directions.

Explanation

 Silicon constitutes approximately 27.7% of the Earth's crust by weight.

It is the second most abundant element in the crust, following oxygen. 

Explanation

Iron is the second most abundant metal in the Earth's crust, after aluminum.

Iron is also the fourth most common element in the Earth's crust.

In its pure form, iron is a heavy, silvery, magnetic metal. 

Silicon is the second most abundant element in the Earth's crust, after oxygen

Explanation

Gold, silver, and copper are natural minerals found in the earth.

It valued for their distinct properties and wide range of uses.

Explanation

The reason the Earth is described as blue is because of the large oceans on its surface, which are blue.

From space, Earth looks like a blue marble with white swirls.

Some parts are brown, yellow, green, and white.

The blue part is water.

Water covers most of Earth.

ND23-9-2023

Explanation

Except at the magnetic pole, the Earth's magnetic field is always horizontal

 the horizontal component of the earth's magnetic field is zero at the magnetic poles.

Hence, Earth's magnetic field always has a horizontal component except at the magnetic poles where it is zero.